package com.ebeitech.doorapp.util.compat;

/*
 * Copyright (C) 2011 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import android.content.Context;
import android.content.pm.PackageManager;
import android.os.Build;
import android.os.Handler;
import android.os.Looper;
import android.support.annotation.NonNull;
import android.support.v4.app.Fragment;
import android.support.v4.os.BuildCompat;

import java.util.Arrays;

/**
 * Helper for accessing features in {@link Fragment} introduced after
 * API level 13 in a backwards compatible fashion.
 */
public class FragmentCompat {
	interface FragmentCompatImpl {
		void setMenuVisibility(Fragment f, boolean visible);
		void setUserVisibleHint(Fragment f, boolean deferStart);
		void requestPermissions(Fragment fragment, String[] permissions, int requestCode);
		boolean shouldShowRequestPermissionRationale(Fragment fragment, String permission);
	}

	static class BaseFragmentCompatImpl implements FragmentCompatImpl {
		public void setMenuVisibility(Fragment f, boolean visible) {
		}
		public void setUserVisibleHint(Fragment f, boolean deferStart) {
		}
		public void requestPermissions(final Fragment fragment, final String[] permissions,
									   final int requestCode) {
			Handler handler = new Handler(Looper.getMainLooper());
			handler.post(new Runnable() {
				@Override
				public void run() {
					final int[] grantResults = new int[permissions.length];

					Context context = fragment.getActivity();
					if (context != null) {
						PackageManager packageManager = context.getPackageManager();
						String packageName = context.getPackageName();

						final int permissionCount = permissions.length;
						for (int i = 0; i < permissionCount; i++) {
							grantResults[i] = packageManager.checkPermission(
									permissions[i], packageName);
						}
					} else {
						Arrays.fill(grantResults, PackageManager.PERMISSION_DENIED);
					}

					((OnRequestPermissionsResultCallback) fragment).onRequestPermissionsResult(
							requestCode, permissions, grantResults);
				}
			});
		}
		public boolean shouldShowRequestPermissionRationale(Fragment fragment, String permission) {
			return false;
		}
	}

	static class ICSFragmentCompatImpl extends BaseFragmentCompatImpl {
		@Override
		public void setMenuVisibility(Fragment f, boolean visible) {
			FragmentCompatICS.setMenuVisibility(f, visible);
		}
	}

	static class ICSMR1FragmentCompatImpl extends ICSFragmentCompatImpl {
		@Override
		public void setUserVisibleHint(Fragment f, boolean deferStart) {
			FragmentCompatICSMR1.setUserVisibleHint(f, deferStart);
		}
	}

	static class MncFragmentCompatImpl extends ICSMR1FragmentCompatImpl {
		@Override
		public void requestPermissions(Fragment fragment, String[] permissions, int requestCode) {
			FragmentCompat23.requestPermissions(fragment, permissions, requestCode);
		}

		@Override
		public boolean shouldShowRequestPermissionRationale(Fragment fragment, String permission) {
			return FragmentCompat23.shouldShowRequestPermissionRationale(fragment, permission);
		}
	}

	static class NFragmentCompatImpl extends MncFragmentCompatImpl {
		@Override
		public void setUserVisibleHint(Fragment f, boolean deferStart) {
			FragmentCompatApi24.setUserVisibleHint(f, deferStart);
		}
	}

	static final FragmentCompatImpl IMPL;
	static {
		if (BuildCompat.isAtLeastN()) {
			IMPL = new NFragmentCompatImpl();
		} else if (Build.VERSION.SDK_INT >= 23) {
			IMPL = new MncFragmentCompatImpl();
		} else if (android.os.Build.VERSION.SDK_INT >= 15) {
			IMPL = new ICSMR1FragmentCompatImpl();
		} else if (android.os.Build.VERSION.SDK_INT >= 14) {
			IMPL = new ICSFragmentCompatImpl();
		} else {
			IMPL = new BaseFragmentCompatImpl();
		}
	}

	/**
	 * This interface is the contract for receiving the results for permission requests.
	 */
	public interface OnRequestPermissionsResultCallback {

		/**
		 * Callback for the result from requesting permissions. This method
		 * is invoked for every call on {@link #requestPermissions(android.app.Fragment,
		 * String[], int)}
		 *
		 * @param requestCode The request code passed in {@link #requestPermissions(
		 *     android.app.Fragment, String[], int)}
		 * @param permissions The requested permissions. Never null.
		 * @param grantResults The grant results for the corresponding permissions
		 *     which is either {@link android.content.pm.PackageManager#PERMISSION_GRANTED}
		 *     or {@link android.content.pm.PackageManager#PERMISSION_DENIED}. Never null.
		 *
		 * @see #requestPermissions(android.app.Fragment, String[], int)
		 */
		public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions,
											   @NonNull int[] grantResults);
	}

	/**
	 * Call {@link Fragment#setMenuVisibility(boolean) Fragment.setMenuVisibility(boolean)}
	 * if running on an appropriate version of the platform.
	 */
	public static void setMenuVisibility(Fragment f, boolean visible) {
		IMPL.setMenuVisibility(f, visible);
	}

	/**
	 * Call {@link Fragment#setUserVisibleHint(boolean) setUserVisibleHint(boolean)}
	 * if running on an appropriate version of the platform.
	 */
	public static void setUserVisibleHint(Fragment f, boolean deferStart) {
		IMPL.setUserVisibleHint(f, deferStart);
	}

	/**
	 * Requests permissions to be granted to this application. These permissions
	 * must be requested in your manifest, they should not be granted to your app,
	 * and they should have protection level {@link android.content.pm.PermissionInfo
	 * #PROTECTION_DANGEROUS dangerous}, regardless whether they are declared by
	 * the platform or a third-party app.
	 * <p>
	 * Normal permissions {@link android.content.pm.PermissionInfo#PROTECTION_NORMAL}
	 * are granted at install time if requested in the manifest. Signature permissions
	 * {@link android.content.pm.PermissionInfo#PROTECTION_SIGNATURE} are granted at
	 * install time if requested in the manifest and the signature of your app matches
	 * the signature of the app declaring the permissions.
	 * </p>
	 * <p>
	 * If your app does not have the requested permissions the user will be presented
	 * with UI for accepting them. After the user has accepted or rejected the
	 * requested permissions you will receive a callback reporting whether the
	 * permissions were granted or not. Your fragment has to implement {@link
	 * OnRequestPermissionsResultCallback}
	 * and the results of permission requests will be delivered to its
	 * {@link OnRequestPermissionsResultCallback#onRequestPermissionsResult(
	 * int, String[], int[])}.
	 * </p>
	 * <p>
	 * Note that requesting a permission does not guarantee it will be granted and
	 * your app should be able to run without having this permission.
	 * </p>
	 * <p>
	 * This method may start an activity allowing the user to choose which permissions
	 * to grant and which to reject. Hence, you should be prepared that your activity
	 * may be paused and resumed. Further, granting some permissions may require
	 * a restart of you application. In such a case, the system will recreate the
	 * activity stack before delivering the result to your onRequestPermissionsResult(
	 * int, String[], int[]).
	 * </p>
	 * <p>
	 * When checking whether you have a permission you should use {@link
	 * android.support.v4.content.ContextCompat#checkSelfPermission(
	 * android.content.Context, String)}.
	 * </p>
	 *
	 * @param fragment The target fragment.
	 * @param permissions The requested permissions.
	 * @param requestCode Application specific request code to match with a result
	 *    reported to {@link OnRequestPermissionsResultCallback#onRequestPermissionsResult(
	 *    int, String[], int[])}.
	 *
	 * @see android.support.v4.content.ContextCompat#checkSelfPermission(
	 *     android.content.Context, String)
	 * @see #shouldShowRequestPermissionRationale(android.app.Fragment, String)
	 */
	public static void requestPermissions(@NonNull Fragment fragment,
										  @NonNull String[] permissions, int requestCode) {
		IMPL.requestPermissions(fragment, permissions, requestCode);
	}

	/**
	 * Gets whether you should show UI with rationale for requesting a permission.
	 * You should do this only if you do not have the permission and the context in
	 * which the permission is requested does not clearly communicate to the user
	 * what would be the benefit from granting this permission.
	 * <p>
	 * For example, if you write a camera app, requesting the camera permission
	 * would be expected by the user and no rationale for why it is requested is
	 * needed. If however, the app needs location for tagging photos then a non-tech
	 * savvy user may wonder how location is related to taking photos. In this case
	 * you may choose to show UI with rationale of requesting this permission.
	 * </p>
	 *
	 * @param fragment The target fragment.
	 * @param permission A permission your app wants to request.
	 * @return Whether you can show permission rationale UI.
	 *
	 * @see android.support.v4.content.ContextCompat#checkSelfPermission(
	 *     android.content.Context, String)
	 * @see #requestPermissions(android.app.Fragment, String[], int)
	 */
	public static boolean shouldShowRequestPermissionRationale(@NonNull Fragment fragment,
															   @NonNull String permission) {
		return IMPL.shouldShowRequestPermissionRationale(fragment, permission);
	}
}
